WEBVTT AS HE WATCHED THE DEATH TOLLCLIMB ON THE STREETS OF LASVEGAS, MIKE HARTZLER COULDN'TSTOP ASKING QUESTIONS.WHAT MADE HIM GO UP INTO THATROOM AND WANT TO KILL ALL THOSE PEOPLE?DID SOMEONE SEE HIM GOING UP THEELEVATOR WITH 10, 20, WHATEVMANY RIFLES HE HAD, AND HANDGUNSAND DID THEY REPORT IT?DID THEY FIND IT SUSPICIOUDID THEY FIND IT ODD?TODD AS DIRECTOR OF THE GREATERCINCINNATI FUSION CENTER, ONE OFHARTZLER'S PRIMARY JOBS IS TOTRY TO PREVENT MASS SHOOTINGS.BUT HE SAYS IN THE UNITEDSTATES, KEEPING AN INDIVIDUALFROM COMMITTING VIOLENCE APERSON OFTEN REFERRED TO AS LONE WOLF, CAN BE NEARLYIMPOSSIBLE.>> BECAUSE WE'RE A FREE SOCIETYAND PEOPLE HAVE CONSTITUTIONALRIGHTS, IT MAKES US VERYVULNERABLE.TODD: THAT'S WHY WORKERS AT THEFUSION CENTER SPEND HOURSMONITORING PUBLIC CHATTER ONSOCIAL MEDIA CHANNELS LOOKINGFOR COMMENTS THAT COULD LEAD TOCHAOS.BUT HARTZLER SAYS TRACKINGINFORMATION ONLY GOES SO FAR,WHICH IS WHY HE SO OFTEN REPEATSTHE MANTRA WE'VE HEARD SO OFTENSINCE 9/11, IF YOU SEESOMETHING, SAY SOMETHING.EVERYONE IN THIS COUNTRY HASA RESPONSIBILITY TO KEEP ITSAFETODD: NICK CROSSLEY, DIRECTOR OFHAMILTON COUNTY'S EMERGENCYMANAGEMENT AGENCY, AGREES.CROSSLEY SAYS HE'S ALWAYSWORRIED ABOUT SOMEONE ACTINGLIKE A LONE WOLF AND TARGETINGOTHERS.ESPECIALLY IN ANY DOWNTOWNAREA, NOT JUST LAS VEGASIT COULD BE DOWNTOWN CINCINNATI.IT COULD BE DALLAS.IT COULD BE ANYWHERE.SO, I'M ALWAYS SENSITIVE.I'M ALWAYS CONCERNED.I'M ALWAYS AWARE OF THATPOSSIBILITTODD: AS OF THIS AFTERNOON,WORKERS AT THE FUSION CENTER HAD

As he watched the death toll climb on the streets of Las Vegas, Mike Hartzler couldn't stop asking questions.

"What made him go up into that room and want to kill all of those people?" Hartzler said. "Did someone see him going up the elevator with 10, 20, whatever many rifles he had, and handguns - and did they report it? Did they find it suspicious? Did they find it odd?"

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As director of the Greater Cincinnati Fusion Center, one of Hartzler's primary jobs is to try to prevent mass shootings.

But he said in the United States, keeping an individual from committing violence, a person often referred to as a lone wolf, can be nearly impossible.

"Because we're a free society and people have constitutional rights, it makes us very vulnerable," he said.

That's why workers at the Fusion Center spend hours monitoring public chatter on social media channels, looking for comments that could lead to chaos.

But Hartzler said tracking information only goes so far, which is why he so often repeats a mantra people nationwide have heard so often since the 9/11 terror attacks - if you see something, say something.

"Everyone in this country has a responsibility to keep it safe," Hartzler said.

Crossley said he's worried about someone acting like a lone wolf and targeting others.

"I'm always concerned about it," he said. "You've got a big music festival, a guy sets up across the street on the 32nd floor. I don't know how you mitigate that, especially in any downtown area, not just Las Vegas. It could be downtown Cincinnati. It could be Dallas. It could be anywhere. So, I'm always sensitive. I'm always concerned. I'm always aware of that possibility."

As of Monday afternoon, workers at the Fusion Center had not detected any Cincinnati ties for the man accused of causing so much destruction in Las Vegas, Stephen Craig Paddock.